# Example: Zero_Cross_Detection (See the README.md file in the upper level 'examples' directory for more information about examples.) This routine demonstrates the detection and analysis of zero-crossing signals, as well as the control of relays. ## GPIO functions: | GPIO | Direction | Configuration | | ---------------------------- | --------- | ------------------------------------------------------ | | CONFIG_GPIO_OUTPUT_5 | output | control the relay | | CONFIG_GPIO_INPUT_2 | input | pulled up, interrupt from rising edge and falling edge | ## How to use example Before project configuration and build, be sure to set the correct chip target using `idf.py set-target <chip_name>`. ### Hardware Required * A development board with any Espressif SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.) * A USB cable for Power supply and programming * Some jumper wires to connect GPIOs. * Zero cross singal Source ### Configure the project Before compiling the project, configure it using `idf.py menuconfig` ### Build and Flash Build the project and flash it to the board, then run the monitor tool to view the serial output: Run `idf.py -p PORT flash monitor` to build, flash and monitor the project. (To exit the serial monitor, type ``Ctrl-]``.) See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects. ## Example Output ```log I (318) zero_detect: Install gptimer I (328) zero_detect: Install gptimer alarm I (328) zero_detect: Register powerdown callback I (338) zero_detect: Install capture timer I (338) zero_detect: Install capture channel I (348) gpio: GPIO[2]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 I (358) zero_detect: Register capture callback I (358) zero_detect: Enable capture channel I (368) zero_detect: Enable and start capture timer I (368) gpio: GPIO[5]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (878) zero_detect: Measured Time: 6.00ms Hz:166.67 EVENT: OUT OF RANGE COUNT:246 OFF COUNT:0 OPEN COUNT:0 W (878) example: Process suspened, please wait till relay open I (878) example: Set control relay on I (1388) zero_detect: Measured Time: 6.00ms Hz:166.67 EVENT: OUT OF RANGE COUNT:416 OFF COUNT:0 OPEN COUNT:0 W (1388) example: Process suspened, please wait till relay open I (1388) example: Set control relay on I (1898) zero_detect: Measured Time: 8.00ms Hz:125.00 EVENT: OUT OF RANGE COUNT:580 OFF COUNT:0 OPEN COUNT:0 W (1898) example: Process suspened, please wait till relay open I (1898) example: Set control relay on I (2408) zero_detect: Measured Time: 8.00ms Hz:125.00 EVENT: OUT OF RANGE COUNT:708 OFF COUNT:0 OPEN COUNT:0 W (2408) example: Process suspened, please wait till relay open I (2408) example: Set control relay on I (2918) zero_detect: Measured Time: 10.00ms Hz:100.00 EVENT: OUT OF RANGE COUNT:831 OFF COUNT:0 OPEN COUNT:0 W (2918) example: Process suspened, please wait till relay open I (2918) example: Set control relay on I (3428) zero_detect: Measured Time: 10.00ms Hz:100.00 EVENT: OUT OF RANGE COUNT:933 OFF COUNT:0 OPEN COUNT:0 W (3428) example: Process suspened, please wait till relay open I (3428) example: Set control relay on I (3938) zero_detect: Measured Time: 12.00ms Hz:83.33 EVENT: OUT OF RANGE COUNT:1031 OFF COUNT:0 OPEN COUNT:0 W (3938) example: Process suspened, please wait till relay open I (3938) example: Set control relay on I (4448) zero_detect: Measured Time: 12.00ms Hz:83.33 EVENT: OUT OF RANGE COUNT:1116 OFF COUNT:0 OPEN COUNT:0 W (4448) example: Process suspened, please wait till relay open I (4448) example: Set control relay on I (4958) zero_detect: Measured Time: 14.00ms Hz:71.43 EVENT: OUT OF RANGE COUNT:1198 OFF COUNT:0 OPEN COUNT:0 W (4958) example: Process suspened, please wait till relay open I (4958) example: Set control relay on I (5468) zero_detect: Measured Time: 14.00ms Hz:71.43 EVENT: OUT OF RANGE COUNT:1271 OFF COUNT:0 OPEN COUNT:0 W (5468) example: Process suspened, please wait till relay open I (5468) example: Set control relay on I (5978) zero_detect: Measured Time: 16.00ms Hz:62.50 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (6478) zero_detect: Measured Time: 16.00ms Hz:62.50 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (6978) zero_detect: Measured Time: 18.00ms Hz:55.56 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (7478) zero_detect: Measured Time: 18.00ms Hz:55.56 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (7978) zero_detect: Measured Time: 20.00ms Hz:50.00 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (8478) zero_detect: Measured Time: 20.00ms Hz:50.00 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (8978) zero_detect: Measured Time: 22.00ms Hz:45.45 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (9478) zero_detect: Measured Time: 22.00ms Hz:45.45 EVENT: OUT OF RANGE COUNT:1323 OFF COUNT:0 OPEN COUNT:1 I (9978) zero_detect: Measured Time: 24.00ms Hz:41.67 EVENT: OUT OF RANGE COUNT:1335 OFF COUNT:0 OPEN COUNT:1 I (10478) zero_detect: Measured Time: 24.00ms Hz:41.67 EVENT: OUT OF RANGE COUNT:1376 OFF COUNT:0 OPEN COUNT:1 I (10978) zero_detect: Measured Time: 26.00ms Hz:38.46 EVENT: OUT OF RANGE COUNT:1417 OFF COUNT:0 OPEN COUNT:1 I (11478) zero_detect: Measured Time: 26.00ms Hz:38.46 EVENT: OUT OF RANGE COUNT:1456 OFF COUNT:0 OPEN COUNT:1 I (11978) zero_detect: Measured Time: 28.00ms Hz:35.71 EVENT: OUT OF RANGE COUNT:1493 OFF COUNT:0 OPEN COUNT:1 ``` ## Troubleshooting For any technical queries, please open an [issue](https://github.com/espressif/esp-iot-solution/issues) on GitHub. We will get back to you soon.
To create a project from this example, run:
idf.py create-project-from-example "espressif/zero_detection^0.0.2:zero_cross_detection"